25140421 has 4 divisors (see below), whose sum is σ = 25753644. Its totient is φ = 24527200.

The previous prime is 25140389. The next prime is 25140457. The reversal of 25140421 is 12404152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1179396 + 23961025 = 1086^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 25140421 - 2⁵ = 25140389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25140481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306550 + ... + 306631.

It is an arithmetic number, because the mean of its divisors is an integer number (6438411).

Almost surely, 2^25140421 is an apocalyptic number.

It is an amenable number.

25140421 is a deficient number, since it is larger than the sum of its proper divisors (613223).

25140421 is an equidigital number, since it uses as much as digits as its factorization.

25140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613222.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 25140421 is about 5014.0224371257. The cubic root of 25140421 is about 292.9482100063.

Adding to 25140421 its reverse (12404152), we get a palindrome (37544573).

The spelling of 25140421 in words is "twenty-five million, one hundred forty thousand, four hundred twenty-one".